1 <?xml version=
"1.0" encoding=
"UTF-8"?>
2 <!DOCTYPE book PUBLIC
"-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
3 "http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
4 <refentry id=
"radians">
9 <holder>Khronos Group
</holder>
12 <refentrytitle>acos
</refentrytitle>
13 <manvolnum>3G
</manvolnum>
16 <refname>acos
</refname>
17 <refpurpose>return the arccosine of the parameter
</refpurpose>
19 <refsynopsisdiv><title>Declaration
</title>
22 <funcdef>genType
<function>acos
</function></funcdef>
23 <paramdef>genType
<parameter>x
</parameter></paramdef>
27 <refsect1 id=
"parameters"><title>Parameters
</title>
30 <term><parameter>x
</parameter></term>
33 Specify the value whose arccosine to return.
39 <refsect1 id=
"description"><title>Description
</title>
41 <function>atan
</function> returns the angle whose trigonometric cosine is
42 <inlineequation><mml:math><mml:mi mathvariant=
"italic">x
</mml:mi></mml:math></inlineequation>.
43 The range of values returned by
<function>acos
</function> is
44 <inlineequation><mml:math>
45 <mml:list order=
"numeric">
49 </mml:math></inlineequation>.
50 The result is undefined if
51 <inlineequation><mml:math><mml:apply><mml:gt /><mml:apply><mml:abs /><mml:mi mathvariant=
"italic">x
</mml:mi></mml:apply><mml:mn>1</mml:mn></mml:apply></mml:math></inlineequation>.
54 <refsect1 id=
"versions"><title>Version Support
</title>
55 <informaltable frame=
"topbot">
60 <entry>acos
</entry>#newin11#
66 <refsect1 id=
"seealso"><title>See Also
</title>
68 <citerefentry><refentrytitle>sin
</refentrytitle></citerefentry>,
69 <citerefentry><refentrytitle>cos
</refentrytitle></citerefentry>,
70 <citerefentry><refentrytitle>asin
</refentrytitle></citerefentry>,
71 <citerefentry><refentrytitle>tan
</refentrytitle></citerefentry>
74 <refsect1 id=
"Copyright"><title>Copyright
</title>
76 Copyright
<trademark class=
"copyright"></trademark> 2011 Khronos Group.
77 This material may be distributed subject to the terms and conditions set forth in
78 the Open Publication License, v
1.0,
8 June
1999.
79 <ulink url=
"http://opencontent.org/openpub/">http://opencontent.org/openpub/
</ulink>.